CVE-2021-35955
MEDIUMCVSS 4.8/10EPSS 0.56%
Last modified
CVE-2021-35955 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Contao >=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.
Description
Contao >=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Contao | Contao | >= 4.0.0, < 4.4.56 |
| Contao | Contao | >= 4.5.0, < 4.9.18 |
| Contao | Contao | >= 4.10.0, < 4.11.7 |
References
- https://github.com/contao/contao/security/advisories/GHSA-hr3h-x6gq-rqcpThird Party Advisory
- https://github.com/contao/contao/security/advisories/GHSA-hr3h-x6gq-rqcpThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-35955?
Contao >=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7.
How severe is CVE-2021-35955?
CVE-2021-35955 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.
How do I fix CVE-2021-35955?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-35955?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST